Weight Converter

Convert mg, grams, kilograms, tonnes, ounces, pounds, stone and US tons.

Weight Converter

Worked example result

Converted weight	0.453592
Summary	1 lb = 0.453592 kg

One pound is exactly 0.45359237 kg — so a 180 lb person weighs about 81.6 kg.

Convert mass between metric and imperial units through the kilogram. The international pound is defined as exactly 0.45359237 kg, so 1 ounce is exactly 28.349523125 g, 1 stone is exactly 14 lb (6.35029318 kg) and a US short ton is exactly 2000 lb (907.18474 kg).

Note the traps: a US ton (2000 lb) is lighter than a metric tonne (1000 kg ≈ 2204.6 lb), and a British long ton (2240 lb) is different again — this converter uses the US short ton.

The formula

Result = Value × (factor of from-unit in kg) ÷ (factor of to-unit in kg)

Worked example

One pound is exactly 0.45359237 kg — so a 180 lb person weighs about 81.6 kg.

The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.

Frequently asked questions

How many pounds are in a stone?

Exactly 14 pounds. Stone is still commonly used for body weight in the UK and Ireland; 10 stone is 140 lb or about 63.5 kg.

Is a ton the same as a tonne?

No. A US short ton is 2000 lb (907.18 kg), a metric tonne is 1000 kg, and a British long ton is 2240 lb (1016 kg).

How many ounces are in a pound?

Exactly 16 avoirdupois ounces. (Troy ounces, used for precious metals, are heavier and divide a troy pound into 12.)

Category: Unit Conversions calculators

Weight Converter